C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 7/50 (2006.01) C01F 7/30 (2006.01)
Patent
CA 2103679
2103679 9213801 PCTABS00014 Aluminium and fluorine are recovered from fluorine containing waste materials from the production of aluminium metal (FCWM) as AlF2OH hydrate by a process comprising: leaching FCWM with dilute sulphuric acid at a pH value within the range 0-3, if needed adding aluminium in an acid soluble form; adjusting the pH value of the aqueous phase to a value within the range 3.7-4.1 at the end of the leaching period by addition of a caustic aqueous solution; precipitating silica at a temperture not exceeding 60 ·C; separating the reaction mixture into a solid phase containing precipitated silica and non-soluble residues of the FCWM and a purified solution; and precipitating AlF2OH hydrate from the purified solution at a temperature within the range 90-100 ·C and at a pH value not exceeding about 4.1 by controlled continuous addition of an aqueous caustic solution. Reducing and/or non-oxidizing operating conditions are maintained during all these process steps. The precipitated AlF2OH may be calcined at a temperature within the range 500-600 ·C to produce AlF3, Al2O3, which is expedient for use in processes for the production of aluminium metal by electrolytic production of alumina.
Kaaber Henning
Mýllgaard Mogens
Kaaber Henning
Mccarthy Tetrault Llp
Mýllgaard Mogens
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